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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd47769751d6fb4b4ea68051e614c99eda4ac078643db2b45fae23f95de2f7cb' 
  AND token = 'htMJBi2eOXwBbQ6aW3/1XFEd6gpxairkhdH8d3sKYz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}